I’m Julien Nyambal

Machine Learning Engineer Software Engineer Data Scientist Traveller
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About Me

I’m Julien, a Data Science & Data Engineering Manager at MTN Group Fintech, where my teams build lending products for MTN Mobile Money (MoMo) subscribers. I am also a Python Subject Matter Expert at FourthRev - University of Cambridge.

Over the past several years I have worked as a Machine Learning Engineer and Software Engineer across banking and fintech, taking models from first prototype to production and building the back-end systems around them. What drives me is seeing code running in production and solving a real-world problem.

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Portrait of Julien Nyambal

Experience

  • Manager: Data Science & Data Engineering

    MTN Group - Fintech - Mobile Money (MoMo): 2023-Present

    Leading Data Science and Data Engineering initiatives that power digital lending products across Africa. Responsible for data platforms, credit risk analytics, machine learning solutions, and scalable data pipelines that enable financial inclusion for millions of Mobile Money customers.

  • Python Subject Matter Expert (SME)

    FourthRev - University of Cambridge: 2025-Present

    Serving as a Python Subject Matter Expert, mentoring professionals in software development, data engineering, AI, and automation while supporting industry-aligned learning programmes and practical project delivery.

  • Lecturer: Software Engineering

    HyperionDev: 2024-2025

    Delivered advanced instruction in data structures, algorithms and software engineering for industry professionals. I also taught software engineering using Python and JavaScript, and led courses on Machine Learning Fundamentals for bootcamp students.

  • Machine Learning Engineer

    Capitec Bank - Business Bank - Client Experience Delivery : 2022-2023

    Built new data-driven software for Business Bank.

  • Machine Learning Engineer

    Entelect - Standard Bank Corporate and Investment Banking - Digital Insights: 2020-2022

    Led a small team of Data Engineers, Software Engineers and Data Scientists to build FX Tips, a data-driven tool that tips corporate clients to buy or sell Forex products. The project is fully in production and brought in around $300,000 in revenue, making it profitable within its first 6 months of launch. I wrote the very first lines of code for the project and orchestrated the different components and pipelines needed to predict the propensity to buy or sell a Forex product. The Python project was supported by CI/CD, cloud, TensorFlow, Git and Control-M.

  • Software Engineer

    Entelect - Standard Bank Corporate and Investment Banking - Risk: 2019-2020

    Worked in a team of 3 to automate the generation of Forex reports for internal use by Standard Bank Risk teams. The reports were previously produced with specialised licensed software that was expensive in the long term, so the aim was to build an in-house replacement. I was responsible for the main backend codebase holding all the logic, which involved structuring the backend server and writing the API endpoints for each use case. This Docker-based API project is in production and performs on par with the software originally bought for the purpose.

  • Part-Time Lecturer

    University of the Witwatersrand: 2019-2021

    Lectured 1st and 2nd year students on Introduction to Programming using C++ and Python, Data Structures and Algorithms, and Computer Networks.

  • Machine Learning Engineer

    Retro Rabbit - Nedbank: 2019

    Worked on Avo by Nedbank. I wrote the initial customer segmentation logic to group the potential customers by spending habits. I was also closely involved in improving the customer experience by collecting customer data from both the app and other sources to propose better products.

  • Machine Learning Engineer

    Retro Rabbit - Kalido: 2018-2019

    Worked on Kalido. My role was mainly to maintain and improve the Machine Learning models for the systems on AWS Cloud. This involved reading new papers, A/B testing, creating custom datasets and training models.

Skills

Data Engineering Machine Learning Microsoft Fabric Apache Airflow Python SQL Generative AI AI Agents MLOps Cloud Architecture Technical Leadership Credit Risk Analytics

SERVICES

Python
Python
Machine Learning
Machine Learning
Training
Training
Data Engineering
Data Engineering
Data Science
Data Science
Software Engineering
Software Engineering

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